Fixture for turning machines



July 17, 1923.

"1,461,884 W. R. ADAMS ET AL FIXTURE FOR TURNING MACHINES Filed Sept. 4, 1920 3 Sheets-Sheet 1 mom m1 July 17 1923.

W. R. ADAMS ET AL FIXTURE FOR TURNING MACHINES All July 17, 1923.

-W. R. ADAMS ET AL FIXTURE FOR TURNING MACHINES Filed Sept. 4, 1920 3 Sheets-Sheet 5 1 I -1-27: WM.

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WILLI 3. ADS, OF PLMNFIELD, AND HARRY L. POUND, OF ll'ORTH PLAINFIELD,

JERSEY, ASSIGNORS T INTERNATIONAL MOTOR COMPANY, OF NEW YORK,

N. Y., A CORPORATION OF DELAWARE.

FIXTURE FOB TURNING MACHINES.

Application filed September a, 1920. Serial No. 408,237.

To all whom it com'm'n:

Be it known that we, WILLIAM R. ADAMS and Y L. POUND, citizens of the United for Turning Machines, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to a fixture which can be attached to turning machines for cutting stock eccentrically and is designed primarily with reference to such a fixture for the turning of eccentric reliefs for oil on pistons. It is desirable to turn off eccentric reliefs on the pistons of internal combustion engines in line with the wrist pins for the oil and this operation has usually been performed by grinding of, making a relativeliy expensive and irregular finish. In accor ance with the present invention it is proposed to turn off the eccentric reliefs by means of a cutting tool which may be associated with a turning machine of any standthe invention to be limite ard type and which will becontrolled bythe,

machine in a common manner and require no more than the usual attention from the machine attendant. In carrying out the invention'there is provided a spring-pressed reciprocable tool head which engages an oval shaped cam mounted on the chuck, this cam in its rotation reciprocating the tool and permitting it to engage the work periodically at dlametrical sides of the piston so as to cut the reliefs. The details of one particular embodiment will appear from the a&ompanying drawings, in which- Figure 1 is a view in plan of the improved fixture showing its association with a turning machine of lmown type. 3

I igure 2 is a view in side elevation of parts shown in Figure 1. I

Figure 3 is a viewin rear elevation of a fixture showing its relation to the chuck and a feeding element.

. As the description proceeds it will be clear to the mechanic that the im roved attachment is not limited in its app cation to any particular type of turnin machine nor is to the details of the particular embodiment of fixture illustrated herein, the principle of operation and the results achieved, all as brought out by the illustrated embodiment, being suflicient information to one skilled in the art for the construction of other operative embodiments.

The bed of the turning machine has secured thereto a cross-way a in which is slidably mounted a cross-slide b for reciprocation towards and away from the work. The work operated upon which, in the present instance, is assumed to be a piston, is secured in a rotatable chuck c by an suitable means, illustrated as a plunger 0 and transverse holding pin 0 passing through the plunger and adapted to engage the piston indicated in dotted lines in igure 2.

The tool head (i in which the tool al is supported in operative relation to the work travels transversely of the cross-slide b in wa s 6 moving longitudinally of the piston turning machine in any approved manner and feed the tool transversely in accordance with common practice and against the tension of a spring f which serves to return the tool to initial position automatically after each cut is made. On the tool head I) is mounted an elongated roller (1 adapted to bear against a cam 'g' mounted adjustably on the chuck 0 through slots 9 and studs 9 permitting angular adjustment of the cam about its axis. It is evident that the cam may take any form according to the character of the cut desired, although in the illustrated embodiment where reliefs are cut at diametrically opposite sides an'oval cam is' employed.

The cross-slide b with the tool head (1 is pressed toward the work by means of springs h which may seat on the rear edge of the cross-slide and on rings 5 threaded adjustably on bolts 1; secured in lugs 11' car'- 7 ried with the base a of the fixture. By determining-properly the position of the adjustable spring seats 6 it is evident that the degree of pressure exerted on the cross-slide b can be regulated to anicety. Y

In using the improved fixture and assum ing that eccentric reliefs are to be cut on pistons in the line of the wrist. pins, the piston is secured in the chuck-c as through retaining devices 0, 0 The tool (1' will be positioned automatically by the spring f in lengthwise. The cam 9 will be adjusted axially'through the slot and stud connection g, 9 so as to permit the tool (1 to engage the outer surface of the piston head at diametrically opposite points along the lines on which the reliefs are to be cut. .The springs h acting through the cross-slides b and the tool head d will press the roller 01 firmly against the periphery of the cam 9, this engagement limiting the inward position of the tool d with relation to the piston. When the machine isstarted up, rotation of the cam 9 will result in forcing the cross-slide b with the tool d away from the piston against the pressure of the springs h. The piston, rotating with the cam y, will present the proper portion to be engaged by the tool after every-half rotation of the cam, the tool d meanwhile being fed longi- -tudinally of the piston and turning the reliefs in the usual manner.

After the cuts have been madethe piston will be removed from the chuckand the tool head returned to initial position to operate on another piston.

As pointed out hereinbefore the invention 7 is not limited to the type of machine-with which the fixture is associated, to the. details of the fixture itself, nor to the precise outline of the controlling cam, nor the work operated upon.

We claim as our invention:

1. A fixture for turning machines, comprising a cross-slide mounted to reciprocate transversely or the work, a tool holder carried by the cross-slide and mounted to reciprocatetransversely thereof in a direction longitudinally of the work, means for automatically reciprocating the cross-slide, and

means for automatically reciprocating the tool holder.

2. A fixture for turning machines, comprising a cross-slide mounted to reciprocate longitudinally of the work.

transversely of the work springs for moving the cross-slide toward the work', a cam, .carried by the machine chuck, for moving the cross-slide away from the work, a tool holder carried by the slide and mounted to reciprocate transversely thereof in a direction longitudinally of the work, and means for automatically reciprocating the tool holder.

3. In combination with the chuck of a turning machine, a fixture for the machine comprising a base, va cross slide mounted on the base, a tool head carried by the cross slide and movable transversely thereof and longitudinally of the work, a cam carried by the chuck and operatively engaging the cam carried by the chuckfor pressinglthe cross slide away from the work, a tool ead movable in ways on the cross slide transversely thereof and longitudinally of the work, and a spring for moving the tool head 5. In 00 'bination with and engaged by the roller. 1

this 30th day of This specification signed WILLIAM R. ADAMS. HARRY L. POUND.

the chuck of a v 'turmng machine, a fixture secured to the 

